EVERYDAY SCIENCE

Detailed explanation-1: -No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Detailed explanation-2: -Law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction. The physical state of the substance or the properties of the chemical elements change in a chemical reaction, but no atoms are created or destroyed.

Detailed explanation-3: -According to Dalton’s atomic theory, atoms can neither be created nor be destroyed in a chemical reaction.

Detailed explanation-4: -Energy cannot be created or destroyed in chemical reactions. All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.